a lot of things can be done with relays - but have to be creative : 

assuming there is 3 types of relays : 
1. personal : self configured r/w and optional links to outbox
2. private : can be community or utility based, e2ee 
3. global : outbox model 

this is on establishing personal relays  as "relay as a service" concept - which enables privacy and gives users full ownership of their data. 

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this is on establishing trending topics that is relevant to the individuals based on their selected private relays 

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there is a lot more than can be done just by using whatever we have and getting creative in maximising outputs